Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2990
AuthorsRicco, C.* 
Aquino, I.* 
Borgstrom, S.* 
Del Gaudio, C.* 
TitleThe study of tilt change recorded from July to October 2006 at the Phlegrean Fields (Naples, Italy)
Issue Date2007
URIhttp://hdl.handle.net/2122/2990
KeywordsMonitoring
tilt network
ground deformation
spectral analysis
decorrelation methodology.
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
AbstractThe tiltmetric dataset of Phlegrean Fields area showed a discrete correlation with the volcanic dynamics, suggesting that the tiltmetric monitoring is important for the surveillance of active volcanic areas. Tilt data recorded in 2006 at 2 stations belonging to the monitoring network of the Osservatorio Vesuviano (I.N.G.V., National Institute for Geophysics and Volcanology, Italy) in the Phlegrean Fields are discussed in this paper. The acquired signals have shown a strong tiltmetric inversion that took place from the end of July 2006. After correcting tilt variations to eliminate the influence of temperature (influencing 90% of the signal at OLB station, hereafter OLB) a significant value of the tilt still remains. This change is related to a local inflation episode lasted 3 months, during an unrest phase started 2 years before. It is interesting to note that tilt amplitude is much greater at OLB than the slope of the displacement field predicted by the theoretical inflation models, but data show that this field is not homogeneous and in some areas very tilted. Moreover, in the last days before the end of tilt inversion, a low energy seismic swarm happened at about 1 km of distance from the tiltmetric station by hundreds of VT (volcano-tectonics) and LP (long-period) events.
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